NEET 2013 Physics question

The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of is -

Answer: (2)

Solution

For a cell of emf and internal resistance driving a current through an external resistance : . \dfrac{2.1}{10 + r}\dfrac{2.1}{0.2}$ = 10.5

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Question ID VK-091320